A: 观察水的沸腾
B: 空气推动塞子时,内能减少
C: 空气被压缩时内能增大
D: 内燃机压缩冲程
Various ways have been provided for us to solve the problem. We can choose _____to start with.
—What is the of the sign on the bottle?—It “Keep away from the children”.